Effect of the entropy on the shear viscosity of metallic glasses near the glass transition

2023/11/19 by A. S. Makarov, Makarov, A. S., Jingbiao Cui +9
Engineering · Materials Science · Physics and Astronomy · #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Material Dynamics and Properties #Metallic Glasses and Amorphous Alloys #Theoretical and Computational Physics

paper · pdf · doi:10.48550/arxiv.2311.11263

openalex publication_date 2023/11/19 · openalex created_date 2023/11/22 · openalex updated_date 2026/07/28

Abstract

We measured the shear viscosity of 14 metallic glasses differing with their mixing entropy ΔS_mix. It is found that the viscosity at the glass transition temperature T_g significantly increases with ΔS_mix. Using calorimetric data, we calculated the excess entropy of all glasses ΔS with respect to their maternal crystalline states as a function of temperature. It is shown that the excess entropy ΔS both at room temperature and at T_g decreases with ΔS_mix. It is concluded that glasses with "high mixing entropy" ΔS_mix correspond to MGs with low excess entropy ΔS. The origin of the increased shear viscosity at T_g of glasses with high ΔS_mix is determined by their reduced excess entropy ΔS.

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